A method for preparing a Bi / Bi2WO6 photocatalyst with dual plasmon resonance

Abstract

This invention discloses a method for preparing a Bi / Bi2WO6 photocatalyst with dual plasmon resonance, comprising the following steps: obtaining a Bi / Bi2WO6 composite photocatalyst through a one-step hydrothermal synthesis method, achieving synchronous growth of Bi nanoparticles and Bi2WO6, so that Bi nanoparticles are uniformly distributed on the surface of Bi2WO6 nanosheets, and the photocatalyst prepared by this method has excellent photocatalytic performance.

Description

Technical Field

[0001] This invention belongs to the field of energy catalysis technology and relates to a method for preparing a Bi / Bi2WO6 photocatalyst with dual plasmon resonance. Background Technology

[0002] With the over-burning of fossil fuels, the energy crisis and environmental pollution have become serious global problems. Ensuring energy supply security and achieving environmental remediation are major challenges for current development and key issues that my country must prioritize in implementing its sustainable development strategy. Against this backdrop, carbon dioxide capture and conversion into value-added hydrocarbon fuels is considered a sustainable and clean energy conversion technology. With the aid of photocatalysts, and using the inexhaustible solar energy as the sole energy source, carbon dioxide and water can be directly converted into chemicals and fuels. This action will help mitigate climate change while providing renewable fuels.

[0003] Plasmon nanomaterials for photocatalysis can achieve localized surface plasmon resonance (LSPR) through photon absorption. This process significantly enhances the catalyst's light absorption and generates a strong localized electromagnetic field on the catalyst surface, thereby transferring more energy into the reaction system. More importantly, the hot electrons generated by plasmon relaxation can transfer to carbon dioxide molecules adsorbed on the catalyst surface, thus driving the catalytic reaction. Bi₂WO₆, as a representative bismuth-based oxide, possesses a suitable band structure and good thermal and photostable stability, making it a suitable material for carbon dioxide emission reduction. However, pure Bi₂WO₆ exhibits low photocatalytic performance due to its low photoelectron separation efficiency and low light energy utilization. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing a Bi / Bi2WO6 photocatalyst with dual plasmon resonances. The photocatalyst prepared by this method has excellent photocatalytic performance.

[0005] To achieve the above objectives, this invention discloses a method for preparing a Bi / Bi2WO6 photocatalyst with dual plasmon resonance, comprising the following steps: obtaining a Bi / Bi2WO6 composite photocatalyst through a one-step hydrothermal synthesis method to achieve the synchronous growth of Bi nanoparticles and Bi2WO6, so that the Bi nanoparticles are uniformly distributed on the surface of Bi2WO6 nanosheets.

[0006] Specifically, the following steps are included: 1) Change Bi(NO3)3 5H2O is dissolved in a mixed solution of anhydrous ethanol and nitric acid, and then stirred to obtain a clear solution; 2) Na2WO6 2H2O is dissolved in deionized water and then added dropwise to the solution obtained in step 1). The mixture is then stirred to obtain the precursor solution. 3) The precursor solution obtained in step 2) is transferred to an autoclave for hydrothermal reaction. After the reaction is completed, the autoclave is cooled to room temperature and then centrifuged to obtain the precipitate. The precipitate is washed and then freeze-dried to obtain Bi / Bi2WO6 photocatalyst with dual plasmon resonance.

[0007] The specific operation of step 1) is as follows: Anhydrous ethanol and nitric acid were mixed thoroughly to obtain a mixed solution of anhydrous ethanol and nitric acid. Then, Bi(NO3)3 was added. 5H2O was ultrasonically dissolved in a mixed solution of anhydrous ethanol and nitric acid and magnetically stirred at room temperature to obtain a solution.

[0008] Bi(NO3)3 5H2O and Na2WO6 The molar ratio of 2H2O is (0.25~2):(0.125~1).

[0009] The volume ratio of nitric acid, anhydrous ethanol and deionized water is (1~5):(15~20):(10~15).

[0010] The temperature of the hydrothermal reaction in step 3) is 160~200℃.

[0011] The hydrothermal reaction time in step 3) is 6~12 hours.

[0012] In step 3), the precipitated product is washed by centrifugation with deionized water and then freeze-dried for 12 hours.

[0013] The present invention has the following beneficial effects: In the specific operation of the preparation method of Bi / Bi2WO6 photocatalyst with dual plasmon resonance described in this invention, the Bi / Bi2WO6 composite photocatalyst obtained by one-step hydrothermal synthesis achieves the synchronous growth of Bi nanoparticles and Bi2WO6, so that the Bi nanoparticles are uniformly distributed on the surface of Bi2WO6 nanosheets. By combining the two plasmon resonance catalysts together, the concentration of hot electrons generated is greatly increased, thereby achieving efficient photocatalytic carbon dioxide reduction. Attached Figure Description

[0014] Figure 1a Here is a SEM image of the catalyst obtained in Example 6; Figure 1bThis is a SEM image of BWO; Figure 1c SEM image of BWO-OV; Figure 2 The X-ray diffraction patterns of the catalyst obtained in Example 6 with BWO and BWO-OV are shown below. Figure 3 The UV-Vis-NIR diffuse reflectance spectrum of the catalyst obtained in Example 6; Figure 4 This is a schematic diagram of the photocurrent response of the catalyst obtained in Example 6 with BWO and BWO-OV; Figure 5 The graph shows the photocatalytic carbon dioxide reduction performance of the catalyst obtained in Example 6 with BWO and BWO-OV. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, not all embodiments, and are not intended to limit the scope of the present invention. Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion regarding the concepts disclosed in the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0016] The accompanying drawings show structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not drawn to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0017] The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) Change Bi(NO3)3 5H2O was dissolved in a mixed solution of anhydrous ethanol and nitric acid, and then stirred at room temperature to obtain a transparent and homogeneous solution. 2) Na2WO6 2H2O is dissolved in deionized water and then added dropwise to the solution obtained in step 1). The mixture is then stirred at room temperature to obtain the precursor solution. 3) The precursor solution obtained in step 2) is transferred to an autoclave for hydrothermal reaction. After the reaction is completed, the autoclave is cooled to room temperature and then centrifuged to obtain the precipitate. The precipitate is washed and then freeze-dried to obtain Bi / Bi2WO6 photocatalyst with dual plasmon resonance.

[0018] In this embodiment, the specific operation of step 1) is as follows: Anhydrous ethanol and nitric acid were mixed thoroughly to obtain a mixed solution of anhydrous ethanol and nitric acid. Then, Bi(NO3)3 was added. 5H2O was ultrasonically dissolved in a mixed solution of anhydrous ethanol and nitric acid and magnetically stirred at room temperature to obtain a transparent and homogeneous solution.

[0019] In this embodiment, Bi(NO3)3 5H2O and Na2WO6 The molar ratio of 2H2O is (0.25~2):(0.125~1).

[0020] In this embodiment, the volume ratio of nitric acid, anhydrous ethanol and deionized water is (1~5):(15~20):(10~15).

[0021] In this embodiment, the temperature of the hydrothermal reaction in step 3) is 160~200 ℃, and the reaction time is 6~12h.

[0022] In this embodiment, in step 3), the precipitated product is washed by centrifugation with deionized water and then freeze-dried for 12 hours.

[0023] This invention introduces oxygen vacancies into Bi₂WO₆, generating more bond sites and defect states on the surface to capture photoelectrons and enhancing carbon dioxide adsorption. Furthermore, when the concentration of oxygen vacancies reaches a certain value, electron enrichment at these vacancies induces localized surface plasmon resonance. Moreover, bismuth nanoparticles are typical non-noble metal plasmon photocatalysts, and their introduction induces a second type of localized surface plasmon resonance. Under the combined effect of these two plasmon resonances, the catalyst's light absorption capacity is significantly enhanced, and the concentration of hot electrons is greatly increased compared to traditional plasmon metal / semiconductor catalysts. Simultaneously, the enhanced electromagnetic field and localized thermal effects induced by plasmon resonance both promote the photocatalytic reduction of carbon dioxide.

[0024] Example 1 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) After thoroughly mixing 15 mL of anhydrous ethanol and 2 mL of nitric acid, weigh out 0.9701 g of Bi(NO3)3. Dissolve the 5H2O in it using ultrasound, and then stir magnetically at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.6594g of Na2WO6 Dissolve 2H2O in 10mL of deionized water by sonication to form a homogeneous solution, then add it dropwise to the solution obtained in step 1), and stir at room temperature for 2h to obtain a homogeneous precursor solution; 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 200 °C for 6 h. After the autoclave was cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0025] Example 2 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) After mixing 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, weigh out 0.4850 g of Bi(NO3)3. Dissolve the 5H2O in it using ultrasound, and then stir magnetically at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.3297g of Na2WO6 Dissolve 2H2O in 10mL of deionized water by sonication to form a homogeneous solution, then add it dropwise to the solution obtained in step 1), and stir at room temperature for 2h to obtain a homogeneous precursor solution; 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 200 °C for 6 h. After the autoclave was cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0026] Example 3 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) First, mix 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, then weigh out 0.2625 g of Bi(NO3)3. Dissolve the 5H2O in it using ultrasound, and then stir magnetically at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.1648g of Na2WO6 Dissolve 2H2O in 10mL of deionized water by sonication to form a homogeneous solution, then add it dropwise to the solution obtained in step 1), and stir at room temperature for 2h to obtain a homogeneous precursor solution; 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 200 °C for 6 h. After the autoclave was cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0027] Example 4 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) First, mix 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, then weigh out 0.1412 g of Bi(NO3)3. Dissolve the 5H2O in it using ultrasound, and then stir magnetically at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.0824g of Na2WO6 2H2O was ultrasonically dissolved in 10 mL of deionized water to form a homogeneous solution, which was then added dropwise to the solution obtained in step 1). The solution was then stirred at room temperature for 2 h to obtain a homogeneous precursor solution. 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 200 °C for 6 h. After the autoclave was cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0028] Example 5 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) First, mix 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, then weigh out 0.1412 g of Bi(NO3)3. Dissolve the 5H2O in it using ultrasound, and then stir magnetically at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.0412g of Na2WO6 2H2O was ultrasonically dissolved in 10 mL of deionized water to form a homogeneous solution, which was then added dropwise to the solution obtained in step 1). The solution was then stirred at room temperature for 2 h to obtain a homogeneous precursor solution. 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 200 °C for 6 h. After the autoclave was cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0029] Example 6 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) After mixing 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, weigh out 0.1412 g of Bi(NO3)3. Dissolve the 5H2O in it using ultrasound, and then stir magnetically at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.0824g of Na2WO6 2H2O was ultrasonically dissolved in 15 mL of deionized water to form a homogeneous solution, which was then added dropwise to the solution obtained in step 1). The solution was then stirred at room temperature for 2 h to obtain a homogeneous precursor solution. 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 200 °C for 6 h. After the autoclave was cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0030] Example 7 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) First, mix 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, then weigh out 0.1412 g of Bi(NO3)3. Dissolve the 5H2O in it using ultrasound, and then stir magnetically at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.0824g of Na2WO6 2H2O was ultrasonically dissolved in 10 mL of deionized water to form a homogeneous solution, which was then added dropwise to the solution obtained in step 1). The solution was then stirred at room temperature for 2 h to obtain a homogeneous precursor solution. 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 180 °C for 6 h. After the autoclave cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0031] Example 8 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) First, mix 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, then weigh out 0.1412 g of Bi(NO3)3. The solution was dissolved in 5H2O by ultrasonication and then magnetically stirred at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.0824g of Na2WO6 2H2O was ultrasonically dissolved in 10 mL of deionized water to form a homogeneous solution, which was then added dropwise to the solution obtained in step 1). The solution was then stirred at room temperature for 2 h to obtain a homogeneous precursor solution. 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 160 °C for 6 h. After the autoclave was cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0032] Example 9 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) First, mix 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, then weigh out 0.1412 g of Bi(NO3)3. The solution was dissolved in 5H2O by ultrasonication and then magnetically stirred at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.0824g of Na2WO6 2H2O was ultrasonically dissolved in 10 mL of deionized water to form a homogeneous solution, which was then added dropwise to the solution obtained in step 1). The solution was then stirred at room temperature for 2 h to obtain a homogeneous precursor solution. 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and hydrothermally reacted at 200 °C for 8 h. After the autoclave cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0033] Example 10 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) First, mix 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, then weigh out 0.1412 g of Bi(NO3)3. The solution was dissolved in 5H2O by ultrasonication and then magnetically stirred at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.0824g of Na2WO6 2H2O was ultrasonically dissolved in 10 mL of deionized water to form a homogeneous solution, which was then added dropwise to the solution obtained in step 1). The solution was then stirred at room temperature for 2 h to obtain a homogeneous precursor solution. 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and hydrothermally reacted at 200 °C for 10 h. After the autoclave cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0034] Example 11 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonances according to the present invention includes the following steps: 1) First, mix 15 mL of anhydrous ethanol and 2 mL of nitric acid thoroughly, then weigh out 0.1412 g of Bi(NO3)3. The solution was dissolved in 5H2O by ultrasonication and then magnetically stirred at room temperature for 1 hour to obtain a transparent and homogeneous solution. 2) Weigh out 0.0824g of Na2WO6 2H2O was ultrasonically dissolved in 10 mL of deionized water to form a homogeneous solution, which was then added dropwise to the solution obtained in step 1). The solution was then stirred at room temperature for 2 h to obtain a homogeneous precursor solution. 3) The precursor solution obtained in step 2) was transferred to a polytetrafluoroethylene-lined stainless steel autoclave and then hydrothermally reacted at 200 °C for 12 h. After the autoclave was cooled to room temperature, the precipitate was obtained by centrifugation. The precipitate was washed with deionized water and then freeze-dried for 12 h to obtain a Bi / Bi2WO6 photocatalyst with dual plasmon resonances.

[0035] Figure 1a This is a SEM image of the catalyst obtained in Example 6. Figure 1c SEM image of BWO-OV Figure 1b For the SEM image of BWO, from Figure 1b As can be seen, BWO has a nanosheet structure.

[0036] refer to Figure 2 Analysis revealed that the XRD patterns of the three samples exhibited four significant characteristic peaks, consistent with Bi₂WO₆ (JCPDS No. 73-2020). Furthermore, the XRD pattern of the sample obtained in Example 6, in addition to the characteristic peaks of BWO, also showed other diffraction peaks consistent with elemental Bi (JCPDS No. 85-1329), further demonstrating the successful construction of the Bi / Bi₂WO₆ photocatalyst.

[0037] refer to Figure 3 Comparative analysis shows that the sample obtained in Example 6 contains both LSPR induced by Bi nanoparticles and LSPR induced by oxygen vacancies.

[0038] refer to Figure 4 ,from Figure 4 The comparison shows that the sample obtained in Example 6 exhibits a higher photocurrent intensity, proving that the dual plasmonic Bi / Bi2WO6 photocatalyst has a stronger photogenerated carrier separation and migration efficiency.

[0039] refer to Figure 5 The Bi / Bi2WO6 photocatalyst with dual plasmon resonances exhibited superior photocatalytic carbon dioxide reduction activity compared to pure phase BWO and BWO-OV sample with one LSPR, and its methane production performance was 23 times that of pure phase BWO. Bi / Bi2WO6 also demonstrated stable and continuous activity in a 15-hour cycle test.

[0040] Example 12 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonance according to the present invention includes the following steps: the Bi / Bi2WO6 composite photocatalyst obtained by one-step hydrothermal synthesis method realizes the synchronous growth of Bi nanoparticles and Bi2WO6, so that the Bi nanoparticles grow uniformly on the surface of Bi2WO6 nanosheets.

[0041] Specifically, the following steps are included: 1) Change Bi(NO3)3 5H2O is dissolved in a mixed solution of anhydrous ethanol and nitric acid, and then stirred to obtain a solution; 2) Na2WO6 2H2O is dissolved in deionized water and then added dropwise to the solution obtained in step 1). The mixture is then stirred to obtain the precursor solution. 3) The precursor solution obtained in step 2) is transferred to an autoclave for hydrothermal reaction. After the reaction is completed, the autoclave is cooled to room temperature and then centrifuged to obtain the precipitate. The precipitate is washed and then freeze-dried to obtain Bi / Bi2WO6 photocatalyst with dual plasmon resonance.

[0042] The specific operation of step 1) is as follows: Anhydrous ethanol and nitric acid are mixed thoroughly to obtain a mixed solution of anhydrous ethanol and nitric acid. Then, Bi(NO3)3 is added... 5H2O was ultrasonically dissolved in a mixed solution of anhydrous ethanol and nitric acid and magnetically stirred at room temperature to obtain a solution.

[0043] Bi(NO3)3 5H2O and Na2WO6 The molar ratio of 2H2O is 2:1.

[0044] The volume ratio of nitric acid, anhydrous ethanol, and deionized water is 1:15:10.

[0045] The temperature of the hydrothermal reaction in step 3) is 160℃.

[0046] The hydrothermal reaction time in step 3) is 6 hours.

[0047] In step 3), the precipitated product is washed by centrifugation with deionized water and then freeze-dried for 12 hours.

[0048] Example 13 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonance according to the present invention includes the following steps: the Bi / Bi2WO6 composite photocatalyst obtained by one-step hydrothermal synthesis method realizes the synchronous growth of Bi nanoparticles and Bi2WO6, so that the Bi nanoparticles grow uniformly on the surface of Bi2WO6 nanosheets.

[0049] Specifically, the following steps are included: 1) Change Bi(NO3)3 5H2O is dissolved in a mixed solution of anhydrous ethanol and nitric acid, and then stirred to obtain a solution; 2) Na2WO6 2H2O is dissolved in deionized water and then added dropwise to the solution obtained in step 1). The mixture is then stirred to obtain the precursor solution. 3) The precursor solution obtained in step 2) is transferred to an autoclave for hydrothermal reaction. After the reaction is completed, the autoclave is cooled to room temperature and then centrifuged to obtain the precipitate. The precipitate is washed and then freeze-dried to obtain Bi / Bi2WO6 photocatalyst with dual plasmon resonance.

[0050] The specific operation of step 1) is as follows: Anhydrous ethanol and nitric acid are mixed thoroughly to obtain a mixed solution of anhydrous ethanol and nitric acid. Then, Bi(NO3)3 is added... 5H2O was ultrasonically dissolved in a mixed solution of anhydrous ethanol and nitric acid and magnetically stirred at room temperature to obtain a solution.

[0051] Bi(NO3)3 5H2O and Na2WO6 The molar ratio of 2H2O is 0.25:0.125.

[0052] The volume ratio of nitric acid, anhydrous ethanol, and deionized water is 5:20:15.

[0053] The temperature of the hydrothermal reaction in step 3) is 200℃.

[0054] The hydrothermal reaction time in step 3) is 12 hours.

[0055] In step 3), the precipitated product is washed by centrifugation with deionized water and then freeze-dried for 12 hours.

[0056] Example 14 The preparation method of the Bi / Bi2WO6 photocatalyst with dual plasmon resonance according to the present invention includes the following steps: the Bi / Bi2WO6 composite photocatalyst obtained by one-step hydrothermal synthesis method realizes the synchronous growth of Bi nanoparticles and Bi2WO6, so that the Bi nanoparticles grow uniformly on the surface of Bi2WO6 nanosheets.

[0057] Specifically, the following steps are included: 1) Change Bi(NO3)3 5H2O is dissolved in a mixed solution of anhydrous ethanol and nitric acid, and then stirred to obtain a solution; 2) Na2WO6 2H2O is dissolved in deionized water and then added dropwise to the solution obtained in step 1). The mixture is then stirred to obtain the precursor solution. 3) The precursor solution obtained in step 2) is transferred to an autoclave for hydrothermal reaction. After the reaction is completed, the autoclave is cooled to room temperature and then centrifuged to obtain the precipitate. The precipitate is washed and then freeze-dried to obtain Bi / Bi2WO6 photocatalyst with dual plasmon resonance.

[0058] The specific operation of step 1) is as follows: Anhydrous ethanol and nitric acid are mixed thoroughly to obtain a mixed solution of anhydrous ethanol and nitric acid. Then, Bi(NO3)3 is added... 5H2O was ultrasonically dissolved in a mixed solution of anhydrous ethanol and nitric acid and magnetically stirred at room temperature to obtain a solution.

[0059] Bi(NO3)3 5H2O and Na2WO6 The molar ratio of 2H2O is 1:0.5.

[0060] The volume ratio of nitric acid, anhydrous ethanol, and deionized water is 3:18:12.

[0061] The temperature of the hydrothermal reaction in step 3) is 180℃.

[0062] The hydrothermal reaction time in step 3) is 8 hours.

[0063] In step 3), the precipitated product is washed by centrifugation with deionized water and then freeze-dried for 12 hours.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a dual plasmonic Bi / Bi2WO6 photocatalyst, characterized in that, Includes the following steps: Bi / Bi2WO6 composite photocatalyst was obtained by a one-step hydrothermal synthesis method, realizing the synchronous growth of Bi nanoparticles and Bi2WO6, so that Bi nanoparticles are uniformly distributed on the surface of Bi2WO6 nanosheets. Specifically, the following steps are included: 1) Change Bi(NO3)3 5H2O is dissolved in a mixed solution of anhydrous ethanol and nitric acid, and then stirred to obtain a clear solution; 2) Na2WO6 2H2O is dissolved in deionized water and then added dropwise to the solution obtained in step 1). The mixture is then stirred to obtain the precursor solution. 3) The precursor solution obtained in step 2) was transferred to an autoclave for hydrothermal reaction. After the reaction was completed, the autoclave was cooled to room temperature and centrifuged to obtain the precipitate. The precipitate was washed and then freeze-dried to obtain Bi / Bi2WO6 photocatalyst with dual plasmon resonance. Bi(NO3)3 5H2O and Na2WO6 The mass ratio of 2H₂O is 0.1412:0.0412; The volume ratio of nitric acid, anhydrous ethanol, and deionized water is (1~5):(15~20):(10~15). The temperature of the hydrothermal reaction in step 3) is 160~200℃.

2. The preparation method of the Bi / Bi₂WO₆ photocatalyst with dual plasmon resonance according to claim 1, characterized in that, The specific operation of step 1) is as follows: Anhydrous ethanol and nitric acid were mixed thoroughly to obtain a mixed solution of anhydrous ethanol and nitric acid. Then, Bi(NO3)3 was added. 5H2O was ultrasonically dissolved in a mixed solution of anhydrous ethanol and nitric acid and magnetically stirred at room temperature to obtain a transparent solution.

3. The preparation method of the Bi / Bi₂WO₆ photocatalyst with dual plasmon resonance according to claim 1, characterized in that, The hydrothermal reaction time in step 3) is 6~12 hours.

4. The method for preparing the Bi / Bi₂WO₆ photocatalyst with dual plasmon resonances according to claim 1, characterized in that, In step 3), the precipitated product is washed by centrifugation with deionized water and then freeze-dried for 12 hours.

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